No, I wont use them because the only way it makes sense is if a guy has the ability to port heads and wants to experiment (which is one reason I did it) and/or has the stuff laying around for free (the other reason I did it). The problem that I have is this leads allot of guys with little to no experience to think they can build some magic 318 with all powerful 302 heads with a harbor freight grinder and a few hundred bucks. The reality is the dude next to them with a wrecking yard 5.9 blows their doors off for half the money and effort. Its not an efficient exercise in how to make power period.